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      Wave dissipation by flexible vegetation

      Riffe, Kassi C.; Henderson, Stephen M.; Mullarney, Julia C.
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      Riffe Henderson Mullarney 2011.pdf
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      DOI
       10.1029/2011GL048773
      Link
       www.agu.org
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      Riffe, K.C., Henderson, S.M. & Mullarney, J.C. (2011). Wave dissipation by flexible vegetation. Geophysical Research Letters, 38, L18607
      Permanent Research Commons link: https://hdl.handle.net/10289/5685
      Abstract
      Dissipation of waves propagating through natural salt marsh vegetation was about half the dissipation expected for rigid vegetation. This low dissipation was predicted by a theoretical model that accounts for bending of vegetation by wave motions. A transect of 3 pulse-coherent Acoustic Doppler Current Profilers recorded water velocity and pressure (at 8 Hz) within the dense (650 stems/m²) canopy of semi-flexible single-stem vegetation (Schoenoplectus americanus). Most wave energy (56 - 81%) was dissipated within 19 m of the marsh edge. Two dissipation models, the first assuming rigid vegetation, and the second simulating wave-forced vegetation motion using the theory for bending of linearly-elastic beams, were tested. After choosing optimal drag coefficients, both models yielded a good fit to the observed dissipation (skill score = 0.95 - 0.99). However, fitted drag coefficients for the rigid model (0.58 - 0.78) were below the range (0.98 - 2.2) expected for the observed Reynolds numbers (13 - 450) and canopy densities (accounting for interactions between stem wakes), whereas drag coefficients for the flexible model (0.97 - 1.6) were nearer the expected range, indicating that prediction of wave dissipation was improved by simulating vegetation motion.
      Date
      2011
      Type
      Journal Article
      Publisher
      American Geophysical Union
      Rights
      Copyright 2011 by the American Geophysical Union.
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      • Science and Engineering Papers [3122]
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